Hogwarts Rule Book

while looking around Hogwarts a character finds a special book. The book allows rules and descriptions of students/teachers to be written and will make it seem natural to all but the owner of the book. uses it to make his stay at Hogwarts more enjoyable for any of the characters in any year that the rule book is found in . the rule book is found in the room of requirement on the seventh floor of hogwarts school of witchcraft and wizardry. in any year of hogwarts school of witchcraft and wizardry.

what year was it found.